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Manufacturer

Various OEM Manufacturers (Compatible Marine Magnetic Compass Spare Unit)

Country of Origin

Japan / Germany / Europe (depending on manufacturer)

Product Type

Marine Magnetic Compass Spare Compass Bowl Assembly

Marine Application

• Merchant Ships
• Oil Tankers
• LNG Carriers
• Bulk Carriers
• Offshore Vessels
• Passenger Ships
• Fishing Vessels
• Naval Ships

Product Introduction

The Marine Magnetic Compass Spare Compass Bowl is one of the most important navigation spare parts carried onboard ships. Installed inside the binnacle, the compass bowl contains the compass card, magnetic needle system, fluid chamber, lubber line, and precision bearing assembly that provide accurate magnetic heading information without relying on electrical power.

Every SOLAS-compliant vessel carries a magnetic compass as an independent navigation instrument. A spare compass bowl allows ship operators to quickly replace a damaged or leaking compass assembly, minimizing downtime and ensuring continuous safe navigation.

What is a Marine Magnetic Compass Spare Bowl?

A compass bowl is the heart of a marine magnetic compass. It consists of a fluid-filled housing that supports the floating compass card and magnetic element. As the vessel changes heading, the magnetic element aligns with the Earth's magnetic field while the compass card provides a stable heading reference for navigation officers.

The spare bowl can often be installed into an existing binnacle without replacing the complete compass system, making it a cost-effective maintenance solution.

Working Principle

The compass bowl operates using the Earth's magnetic field.

• Permanent magnetic elements align with magnetic north.
• The compass card rotates freely in a low-friction fluid.
• Damping fluid minimizes oscillation caused by ship motion.
• The lubber line provides a fixed reference to indicate the vessel's heading.
• The helmsman or navigation officer reads the heading directly from the compass card.

Since it requires no electrical power, the magnetic compass remains operational even during total power failure.

Main Components

A complete spare compass bowl typically includes:

• Compass Card
• Magnetic Needle Assembly
• Compass Fluid Chamber
• Sapphire Pivot Bearing
• Float Assembly
• Lubber Line
• Compass Housing
• Sealing Gaskets
• Filling Plug
• Expansion Chamber
• Mounting Ring
• Protective Cover

Key Features

• High-accuracy magnetic heading indication
• No electrical power required
• Shock-resistant construction
• Precision-balanced compass card
• Corrosion-resistant materials
• Long service life
• Stable performance in rough seas
• Easy replacement in existing binnacles
• SOLAS-compliant navigation backup
• Low maintenance requirements

Marine Applications

The spare compass bowl is widely used on:

• Main Steering Compass
• Emergency Compass
• Bridge Navigation Station
• Binnacle Compass Systems
• Offshore Navigation Consoles
• Training Ships
• Coast Guard Vessels
• Research Vessels

Compatible Compass Brands

This type of spare bowl may be compatible with various marine compass manufacturers, depending on dimensions and specifications:

• C. Plath
• Cassens & Plath
• Tokyo Keiki
• Yokogawa
• Daiko
• Kelvin Hughes
• Anschütz
• Saura
• Nitchi
• Other OEM magnetic compass systems

Common Problems & Troubleshooting

Preventive Maintenance

• Inspect the compass fluid level regularly.
• Check for air bubbles or leaks.
• Keep the bowl clean and free from scratches.
• Protect from excessive vibration.
• Verify heading accuracy during bridge equipment inspections.
• Perform compass adjustment after major repairs or structural modifications.
• Store spare bowls in a dry, vibration-free environment.

Why Ships Still Use Magnetic Compasses

Although modern ships rely on GPS, ECDIS, and gyrocompasses, magnetic compasses remain essential because they:

• Operate without electrical power.
• Serve as the mandatory SOLAS backup compass.
• Continue functioning during total power failures.
• Provide reliable heading information during electronic system failures.
• Require minimal maintenance and offer long operational life.

Frequently Asked Questions (FAQ)

Q1. Can the spare compass bowl replace only the damaged internal assembly?
Yes. In many cases, the spare bowl can be installed into the existing binnacle without replacing the entire compass system.

Q2. Does it require electrical power?
No. It operates solely using the Earth's magnetic field.

Q3. Can it be recalibrated?
Yes. After installation, compass adjustment (swinging) should be performed to ensure heading accuracy.

Q4. Is it suitable for all vessels?
It is suitable for many commercial and offshore vessels, provided the dimensions and specifications match the installed compass system.

Short Product Description

The Marine Magnetic Compass Spare Compass Bowl is a precision replacement assembly designed for ship magnetic compass systems. It provides dependable magnetic heading indication, ensuring safe navigation and compliance with international maritime regulations. Its durable construction, fluid-damped compass card, and compatibility with many leading compass manufacturers make it an essential onboard spare.

User Manual & Technical Resources

Always follow the original manufacturer's installation and maintenance manual for:

• Compass bowl replacement
• Fluid filling procedures
• Compass adjustment (swinging)
• Lubber line alignment
• Routine inspection and maintenance

SM MARINE SERVICE™

SM MARINE SERVICE™ supplies New, Reconditioned, and Tested marine navigation equipment and spare parts for customers worldwide.

Our Services

• Marine Navigation Equipment Supply
• Magnetic Compass Spare Parts
• Gyro Compass Spare Parts
• Marine Automation Equipment
• Worldwide Sourcing
• Repair & Overhaul
• Calibration Services
• Technical Support
• Emergency Ship Supply

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Samir Market, DT Road, Pahartali, Beside CDA Market, Chattogram, Bangladesh

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Shanghai, China

Website: www.smmarineservice.com
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